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def upgrader(cpt):
    """The gem5 GIC extensions change the size of many GIC data
    structures. Resize them to match the new GIC."""

    import re

    if cpt.get("root", "isa", fallback="") != "arm":
        return

    old_cpu_max = 8
    new_cpu_max = 256
    sgi_max = 16
    ppi_max = 16
    per_cpu_regs = (
        ("iccrpr", ["0xff"]),
        ("cpuEnabled", ["false"]),
        ("cpuPriority", ["0xff"]),
        ("cpuBpr", ["0"]),
        ("cpuHighestInt", ["1023"]),
        ("cpuPpiPending", ["0"]),
        ("cpuPpiActive", ["0"]),
        ("interrupt_time", ["0"]),
        ("*bankedIntPriority", ["0"] * (sgi_max + ppi_max)),
    )
    new_per_cpu_regs = (("cpuSgiPendingExt", "0"), ("cpuSgiActiveExt", "0"))

    for sec in cpt.sections():
        if re.search(r".*\.gic$", sec):
            for reg, default in per_cpu_regs:
                value = cpt.get(sec, reg).split(" ")
                assert (
                    len(value) / len(default) == old_cpu_max
                ), "GIC register size mismatch"
                value += [" ".join(default)] * (new_cpu_max - old_cpu_max)
                cpt.set(sec, reg, " ".join(value))

            for reg, default in new_per_cpu_regs:
                cpt.set(sec, reg, " ".join([default] * new_cpu_max))
